package org.apache.maven.repository.metadata;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import org.apache.maven.artifact.ArtifactScopeEnum;

/**
 * metadata graph vertice - just a wrapper around artifact's metadata
 *
 * @author <a href="oleg@codehaus.org">Oleg Gusakov</a>
 */
public class MetadataGraphVertex implements Comparable<MetadataGraphVertex> {
  ArtifactMetadata md;

  // indications to use these in comparrison
  private boolean compareVersion = false;
  private boolean compareScope = false;

  public MetadataGraphVertex(ArtifactMetadata md) {
    super();
    this.md = md;
  }

  public MetadataGraphVertex(ArtifactMetadata md, boolean compareVersion, boolean compareScope) {
    this(md);
    this.compareVersion = compareVersion;
    this.compareScope = compareScope;
  }

  public ArtifactMetadata getMd() {
    return md;
  }

  public void setMd(ArtifactMetadata md) {
    this.md = md;
  }

  // ---------------------------------------------------------------------
  public boolean isCompareVersion() {
    return compareVersion;
  }

  public void setCompareVersion(boolean compareVersion) {
    this.compareVersion = compareVersion;
  }

  public boolean isCompareScope() {
    return compareScope;
  }

  public void setCompareScope(boolean compareScope) {
    this.compareScope = compareScope;
  }

  // ---------------------------------------------------------------------
  @Override
  public String toString() {
    return "[" + (md == null ? "no metadata" : md.toString()) + "]";
  }

  // ---------------------------------------------------------------------
  private static int compareStrings(String s1, String s2) {
    if (s1 == null && s2 == null) {
      return 0;
    }

    if (s1 == null && s2 != null) {
      return -1;
    }

    if (s1 != null && s2 == null) {
      return 1;
    }

    return s1.compareTo(s2);
  }

  // ---------------------------------------------------------------------
  public int compareTo(MetadataGraphVertex vertex) {
    if (vertex == null || vertex.getMd() == null) {
      return 1;
    }

    ArtifactMetadata vmd = vertex.getMd();

    if (vmd == null) {
      if (md == null) {
        return 0;
      } else {
        return 1;
      }
    }

    int g = compareStrings(md.groupId, vmd.groupId);

    if (g == 0) {
      int a = compareStrings(md.artifactId, vmd.artifactId);
      if (a == 0) {
        if (compareVersion) {
          int v = compareStrings(md.version, vmd.version);
          if (v == 0) {
            if (compareScope) {
              String s1 = ArtifactScopeEnum.checkScope(md.artifactScope).getScope();
              String s2 = ArtifactScopeEnum.checkScope(vmd.artifactScope).getScope();
              return s1.compareTo(s2);
            } else {
              return 0;
            }
          } else {
            return v;
          }
        } else {
          return 0;
        }
      } else {
        return a;
      }
    }

    return g;
  }

  // ---------------------------------------------------------------------
  @Override
  public boolean equals(Object vo) {
    if (vo == null || !(vo instanceof MetadataGraphVertex)) {
      return false;
    }
    return compareTo((MetadataGraphVertex) vo) == 0;
  }

  // ---------------------------------------------------------------------

  @Override
  public int hashCode() {
    if (md == null) {
      return super.hashCode();
    }
    StringBuilder hashString = new StringBuilder(128);
    hashString.append(md.groupId + "|");
    hashString.append(md.artifactId + "|");

    if (compareVersion) {
      hashString.append(md.version + "|");
    }

    if (compareScope) {
      hashString.append(md.getArtifactScope() + "|");
    }

    return hashString.toString().hashCode();

    // BASE64Encoder b64 = new BASE64Encoder();
    // return b64.encode( hashString.toString().getBytes() ).hashCode();
  }

  // ---------------------------------------------------------------------
  // ---------------------------------------------------------------------
}
